The Big Sleep is a 1946 film noir directed by Howard Hawks, the first film version of Raymond Chandler's 1939 novel of the same name. The film stars Humphrey Bogart as private detective Philip Marlowe and Lauren Bacall as Vivian Rutledge in a story about the "process of a criminal investigation, not its results." William Faulkner, Leigh Brackett and Jules Furthman co-wrote the screenplay. In 1997, the U.S. Library of Congress deemed the film "culturally, historically, or aesthetically significant," and added it to the National Film Registry.
Because the film was scheduled for release a year after it was made, parts of the original 1945 cut were afterwards significantly rescripted and shot. A copy of the 1945 version was later restored and released in 1997.